I don't think we need Carrick in an advance role though, he doesn't have the ability to dribble the ball with him in tight spots so playing him deep will allow him to utilize his long lost passing instincts which she showed during his three seasons...
Rodwell would give Carrick/Fletch more competition... He's the defensive type one who tends to push high upwards, for example the first leg in the FA vs Chelsea, he was almost playing behind the striker ( can't remember if it was Saha or Beckford ) should have been Saha, but he was getting into very good attacking positions ( Usually fluffed the final ball though ) but I liked the way he drove up there and gave Everton Penetration.
He'd certainly be a player who would be bought for the future, I don't expect immediate results, I don't think the fee will be 25m either as that is a bit too steep for someone who is getting injured almost every month, he's certainly a good prospect...